According to Stars and Stripes, the PS3's price-to-performance ratio was so attractive that an Air Force research team decided to order 1,700 more units to complement the 336 they already have. The 2,000+ PS3s will be linked together to form the 500 TeraFLOPS Heterogeneous Cluster, which runs nearly 100,000 times faster than high-end computer processors on the market currently. This Air Force research group was awarded a $2 million grant for the project."
The article doesn't say but it is highly likely that this cluster will be running Linux a la the Beowulf project. Can you imagine the possibilities for future development now that supercomputers are becoming more and more available for research and modeling?